Brian, sorry about the missed deal, A lot of the time, by the time you see it on CL, or others, it's already too late. Dealers, traders, and breakers have their eyes on these all the time, and as soon as the ad goes up, they call as soon as they see it. A lot of the time, they may not even want it, but to get their name first on list in case they do.
Don't worry, more will come along, in the meantime, keep eyes peeled and look in fencerows, behind barns, and ask around about shade tree mower repairmen that have a lot of stuff setting around. You will be surprised at how much stuff is out there.